Spearmint tea is one of the few PCOS home remedies with an actual randomised controlled trial behind it. The trial is also more nuanced than the posts recommending it usually mention.
A two-centre randomised controlled trial gave 42 women with PCOS either spearmint tea or a placebo herbal tea, twice daily, for 30 days. Forty-one completed it.
The objective measure of hirsutism, the Ferriman-Gallwey score a clinician assigns by examining actual hair growth, showed no significant improvement between the groups (p = 0.12).
That is the finding that usually goes missing. The hormone moved. The hair, as measured by someone else looking at it, did not.
The authors' own explanation is straightforward: hair follicles work on a slow cycle. Thirty days is not long enough for a change in circulating androgens to show up as visibly less hair, no matter how real the hormonal change is. They suggested a longer trial would likely show it.
That is a reasonable argument. It is also, as of now, still an argument rather than a result. Nobody has run the longer trial and published the improvement.
So the honest position is: spearmint tea measurably lowered testosterone in a proper randomised trial, and whether that translates into less hair over six or twelve months is untested rather than disproven.
Hair growth is exactly the kind of slow change memory is terrible at. You will not reliably notice a 15% reduction over four months by looking in the mirror each morning — the comparison you need is against how it was, not how it was yesterday.
Logging unwanted hair as a daily severity, the way PCOS Ai does, gives you a line on a chart instead of an impression. If you start spearmint tea, note the date and let four months of your own data answer the question.
Something that lowers testosterone is doing something real, and "natural" does not mean inert. If you are pregnant, trying to conceive, or on medication that affects hormones, this is worth a sentence to your doctor before you start drinking it twice a day — not because it is dangerous, but because it is active.
For more on what does and does not show up in a short window, see our post on why ovulation tests mislead with PCOS.
General wellness information, not medical or dietetic advice. Nothing here diagnoses, treats or cures PCOS. Nutrition figures are per-serving estimates. Check with your doctor or a registered dietitian before making significant changes — especially if you are pregnant, breastfeeding, diabetic or managing a food allergy.